#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <string.h>
#include <stdbool.h>


bool isUnique(char* astr) {
    bool array[26] = {NULL};
    for (char* ch = astr; *ch != NULL; ch++)
    {
        int tmp = *ch - 'a';
        if (array[tmp])
        {
            return false;
        }
        array[tmp] = true;
    }
    return true;
}


int main()
{

	return 0;
}
